> Do you find that you're able to do cognitively demanding tasks while fasting? Absolutely. > Even small fasts seem to sap my concentration and critical think

> Do you find that you're able to do cognitively demanding tasks while fasting? Absolutely. > Even small fasts seem to sap my concentration and critical thinking. Once I eat again I feel like I think better. That's kind of normal when you start with (intermittent) fasting, may take at least some days until it gets better. Especially if are on a high carb diet and already developed some degree of insulin resistance your body is unable to fully switch into fat burning mode while the glucose stores are already depleted. This results in low energy and food carvings. Once that is regulated well your mental abilities likely won't suffer.